Fire detector



FIG. 1 is a perspective view of the top, front and one side of a fire detector showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof, the bottom view being a mirror image thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a fire detector, as shown and described. 